| 摘要 |
PROBLEM TO BE SOLVED: To provide a combustion control device capable of extracting only knocking signal irrespective of frequency band of a spike noise. SOLUTION: This device includes a signal detection part 3 detecting ion current corresponding to ion generated during combustion of air fuel mixture in a combustion chamber, a data acquisition part ST1 acquiring detection signal output by the signal detection part 3 every sampling cycleτand storing signal input data SG(i), position detection parts ST2-ST3 operating differential of the signal input data SG (i) and specifying sudden change start position at which ion current suddenly changes by determination whether differential operation result exceeds criterion value TH or not, a nose specifying part ST4 specifying a sudden change start position due to noise by comparing sudden change start position generation timing and pre-specified knocking signal cycle, and a data correction part ST5 correcting the signal input data before and after the specified sudden change start position due to noise and substantially eliminating noise component. COPYRIGHT: (C)2008,JPO&INPIT
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